MatchX no TX

[arjanvanb (Arjan)]

Just for the sake of completeness, I wonder how much sooner TTN could schedule RX1:

@htdvisser

We do understand that some applications might require sending an immediate reply, so we allow for a short wait time of 100ms. If your application takes 500ms to respond, the downlink will have missed this window, and will be scheduled for the next opportunity.

And TTN surely prefers RX1 over RX2:

@htdvisser

We try to avoid RX2 if possible. For RX1 we have 8 channels available, while RX2 is fixed on 1 channel and a very inefficient data rate. Therefore, expect most downlink messages to be sent after 1 second. Losing 400 ms on the slow connection is not ideal, but we can handle it.

And github.com/TheThingsNetwork/packet_forwarder/blob/master/docs/IMPLEMENTATION/DOWNLINKS.md explains gateways might need some 100ms themselves as well.